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Study on Electrical Measurement Method of AC Loss in Oxide High Tc Superconducting Magnet

氧化物高温超导磁体交流损耗电学测量方法研究

基本信息

批准号：
15560261
负责人：
MUKAI E.
金额：
$ 1.54万
依托单位：
Sojo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Superconducting magnets have been studied to extend the new technology region. At present, low T_c superconductive wire (LTSW) has almost reached the level of practical use. In contrast, high T_c superconductive wire (HTSW) is more advantageous than LTSW, because it is possible to use liquid nitrogen in the cooling. The HTSW of long-length multi filaments has recently been manufactured, and a shift from LTSW to HTSW is expected in the future. A grasp of AC loss for the superconducting magnet is very important, since the AC loss is essentially generated in the superconducting wire.In this research, the phase difference measurement, which is related to the evaluation of the AC loss of the superconducting magnet, was carried out. The methods of three types were proposed to measure the phase difference of the superconducting magnet and the measurement of the phase difference was performed.First, the superconducting magnet of a double pancake coil was constructed using HTSW with Bi-2223 multi filaments. Next, an exciting test of the magnet using the AC power supply was performed. As a result, it was confirmed that the phase difference between the voltage and the current of the magnet almost approximated 90°. Finally, the phase difference of the superconducting magnet was measured using the electronic circuits of three types. Especially, the measuring result of the electronic circuit using op-amps agrees with the result by a lock-in amplifier comparatively well, and thus it is considered that the electronic circuit is practical.

人们对超导磁体进行了研究，以扩展新技术领域。目前，低T_c超导线材（LTSW）已基本达到实用水平。相比之下，高T_c超导线材（HTSW）比LTSW更有优势，因为可以使用液氮进行冷却。长多丝的 HTSW 最近已生产出来，预计未来将从 LTSW 转向 HTSW。掌握超导磁体的交流损耗非常重要，因为交流损耗本质上是在超导导线中产生的。在本研究中，进行了与超导磁体的交流损耗评估相关的相位差测量。提出了三种测量超导磁体相位差的方法，并进行了相位差的测量。首先，采用Bi-2223多丝HTSW构造了双扁平线圈的超导磁体。接下来，进行使用交流电源的磁体的励磁试验。结果，确认了磁体的电压和电流之间的相位差几乎接近90°。最后，使用三种类型的电子电路测量超导磁体的相位差。特别是，使用运算放大器的电子电路的测量结果与锁定放大器的结果比较一致，因此认为该电子电路是实用的。